cifs: support reconnect with alternate password for SMB1

SMB1 shares the mount and remount code paths with SMB2/3 and already
supports password rotation in some scenarios. This patch extends the
password rotation support to SMB1 reconnects as well.

Cc: [email protected]
Signed-off-by: Meetakshi Setiya <[email protected]>
Signed-off-by: Steve French <[email protected]>

Author: meetakshi253

fs/smb/client/cifssmb.c

@@ -152,8 +152,17 @@ cifs_reconnect_tcon(struct cifs_tcon *tcon, int smb_command)
 	spin_unlock(&ses->ses_lock);
 
 	rc = cifs_negotiate_protocol(0, ses, server);
-	if (!rc)
+	if (!rc) {
 		rc = cifs_setup_session(0, ses, server, ses->local_nls);
+		if ((rc == -EACCES) || (rc == -EHOSTDOWN) || (rc == -EKEYREVOKED)) {
+			/*
+			 * Try alternate password for next reconnect if an alternate
+			 * password is available.
+			 */
+			if (ses->password2)
+				swap(ses->password2, ses->password);
+		}
+	}
 
 	/* do we need to reconnect tcon? */
 	if (rc || !tcon->need_reconnect) {